package com.ls.juc;

import java.util.Random;
import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;

//6辆汽车停到3个停车位
public class SamaphoreDemo {
    public static void main(String[] args) {
        //创建Semaphore,设置许可数量
        Semaphore semaphore = new Semaphore(3);

        for (int i = 1; i <= 6; i++) {
            new Thread(() -> {
                try {
                    //抢占
                    semaphore.acquire();
                    System.out.println(Thread.currentThread().getName() + " : 抢到了车位");

                    //设置停车时间
                    TimeUnit.SECONDS.sleep(new Random().nextInt(5));
                    System.out.println(Thread.currentThread().getName() + " : 离开了车位--");


                } catch (InterruptedException e) {
                    e.printStackTrace();
                }finally {
                    //释放
                    semaphore.release();
                }

            }, String.valueOf(i)).start();

        }

    }
}
